This example demonstrates a minimal D3.js visualization that displays a text message centered on a web page. It shows how to load D3 from a CDN via UNPKG, use the `select` API to query the DOM, and set the text content of an HTML element. The code also imports a local ES6 module to supply the string rendered to the viewer. The visualization relies on standard HTML and CSS for layout and styling, with D3 handling the DOM manipulation.